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Poster: jvshm Date: Dec 15, 2019 12:31am
Forum: texts Subject: advice on reducing pdf file size for uploading

Hi,

If I scan a 250 page book in color at 300 dpi on a large Canon ImageRunner as pdf without compression, I get a several hundred MB pdf. Most books from archive.org have no more than 50 MB but are just as readable. What's the trick?

what I have tried (I have only macs, no access to Win machines):
ImageRunner, scan a compressed pdf - images and text pixelated
Adobe Acrobat X (CS6) save as reduced size pdf - images pixelated and not much smaller
Prizmo - images sometimes best but pdf not much smaller
PDF Expert - images pixelated and not much smaller
PDFPenPro - useless (fans and spinning beach ball, no result)
Cisdem pdf compressor - useless, completely pixelated

eventually I'd like to upload some of them, but I hesitate uploading a 200 MB pdf. This post was modified by jvshm on 2019-12-15 08:31:39

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Poster: Bomb Bloke Date: Jan 5, 2020 1:03am
Forum: texts Subject: Re: advice on reducing pdf file size for uploading

The PDF created by the archive out of the JPG set I uploaded is quite readable, but although the text came out ok, I found the pictures were reduced to mud. The main reduction in quality seems to be in the area of colour depth.

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Poster: jvshm Date: Jan 5, 2020 1:26am
Forum: texts Subject: Re: advice on reducing pdf file size for uploading

ok, thanks, so I scan to jpg in that case.
meanwhile I also found that I can scan to black and white, not even grayscale, and even with 600 dpi get very small and readable files.